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SECTION 11: OPERATION AND MAINTENANCE
DANGER
Warning
Electrical Shock
Hazard
Disconnect electric
before service.
Heater must be
connected to a properly
grounded electrical
source.
Explosion Hazard
Turn off gas supply to
heater before service.
Burn Hazard
Allow heater to cool
before service.
Tubing may still be hot
after operation.
Cut/Pinch Hazard
Wear protective gear
during installation,
operation, and service.
Edges are sharp.
Failure to follow these instructions can result in death, electric shock, injury, or property damage.
This heater is equipped with a direct spark ignition
system.
11.1 Sequence of Operation
1. Turn the thermostat up. When the thermostat calls
for heat, the blower motor will energize.
2. When the motor approaches nominal running
RPM, the pressure switch closes and activates the
ignition module.
3. After a 45 second pre-purge, the ignition module
then opens the gas valve and energizes the spark
igniter.
4. When the flame is established, the sparking
sequence ceases.
5. If the flame is not established during the ignition
sequence, the ignition module closes the
gas valve and purge begins. Module will try
2 additional times for ignition (with purges in
between trials). If ignition is not established, the
module will lockout.
6. If the flame extinguishes during operation, the
ignition module will attempt the multiple trial
sequence described in step 5. If ignition is not re-
established, the module will lockout for one hour
or until reset.
7. After lockout, the control can be reset by turning
down thermostat for five seconds and then
raising it again to desired temperature, or by
disconnecting power and then reconnecting.
8. When thermostat is satisfied, all power to the unit
is shut off.
11.2 To Shut Off Heater
1. Set thermostat to lowest setting.
2. Turn OFF electric power to heater.
3. Turn OFF manual gas valve in the heater supply line.
11.3 To Start Heater
1. Turn gas valve and electric power OFF and wait five
minutes for unburned gases to vent from heater.
2. Turn ON main gas valve.
3. Turn ON electric power.
4. Set thermostat to desired temperature.
5. Burner should light automatically.
11.4 Pre-Season Maintenance and
Annual Inspection
To ensure your safety and years of trouble-free operation
of the heating system, service and annual inspections
must be done by a contractor qualified in the installation
and service of gas-fired heating equipment.
Turn off gas and electric supplies before performing
service or maintenance. Allow heater to cool before
servicing.
Before every heating season, a contractor qualified
in the installation and service of gas-fired heating
equipment must perform a thorough safety inspection
of the heater.
For best performance, the gas, electrical, thermostat
connections, tubing, venting, suspensions, and overall
heater condition should be thoroughly inspected.
Summary of Contents for IRH
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